Multi-Output Power Supply Discharge Circuit Without Voltage Reversal
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Solution Overview
Problem
In traditional power discharge circuits, capacitors connected to lower voltage power supply nodes face difficulties in discharging due to the accumulation of forward voltage across multiple diodes, leading to reversed voltage relationships during power-off sequences, which can cause logic errors, latch-up, or failure in loads.
Innovation Solution
A power supply device with a diode-OR circuit configuration where all diodes share a common cathode connected to a discharge resistor, allowing capacitors to discharge directly to the resistor, reducing the impact of forward voltage accumulation and maintaining the initial voltage relationship throughout the discharge process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes are connected in series between power supply nodes for discharge control, then discharge sequence can be controlled, but forward voltage accumulates causing discharge difficulty for lower voltage nodes
Solution Approach 1:
The patent divides the discharge control into independent parallel paths, each with its own diode connected to a different power supply node. Instead of a single series chain, multiple discharge paths are segmented and connected in parallel to a common discharge resistor, eliminating the cumulative forward voltage effect while maintaining individual node control.
Solution Approach 2:
The patent introduces a common cathode connection point as an intermediary between multiple diodes and the discharge resistor. This intermediary structure allows each diode to independently control discharge from its respective power supply node without the forward voltage of other diodes affecting it, effectively mediating the discharge control function.
2Reliability
If discharge follows descending voltage order through series diodes, then discharge sequence is maintained, but voltage relationship reverses during power-off causing logic errors
Solution Approach 1:
The patent inverts the traditional discharge approach by connecting diode anodes to different voltage nodes and cathodes to a common point, rather than connecting diodes in series from high to low voltage. This inversion allows all nodes to discharge simultaneously to the common cathode without reversing voltage relationships, while still maintaining controlled discharge sequences.
Solution Approach 2:
The patent creates an equipotential reference point at the common cathode connection, where all diode cathodes meet and connect to the discharge resistor. This equipotential structure ensures that voltage relationships among power supply nodes are maintained during discharge, preventing the reversal issues that occur in series configurations.
3Reliability
If multiple diodes are used for discharge control, then discharge sequence is established, but device complexity increases
Solution Approach 1:
The patent merges multiple discharge paths at a common cathode connection point and a single discharge resistor. Instead of requiring separate discharge circuits for each power supply node, the invention combines them into a unified structure where multiple diodes share common connection points, reducing overall circuit complexity while maintaining precise discharge control for each node.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures efficient discharge of capacitors without reversing the voltage relationship among output lines, reducing the likelihood of logic errors or failures in loads and facilitating smooth power-off sequences.
Implementation Method 1
a discharge resistor coupled to the cathodes of the plurality of diodes
Data Source
AI summary
A power supply device includes a power supply circuit configured to output different voltages to a plurality of output lines, a plurality of capacitors provided in correspondence with the plurality of output lines, one end of each of the plurality of capacitors being coupled to a corresponding output line of the plurality of output lines and an other end thereof being coupled to a ground potential, a plurality of diodes provided in correspondence with the plurality of output lines, anodes of the plurality of diodes being coupled to the corresponding output lines and cathodes thereof being commonly coupled, and a discharge resistor coupled to the cathodes of the plurality of diodes.